package com.example.rice.filter;


import com.alibaba.fastjson.JSON;
import com.example.rice.common.BaseContext;
import com.example.rice.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求的地址url
        String requestURI = request.getRequestURI();
        //设置可以直接放行的地址区间
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //如果不需要处理直接放行
        if (check){
            filterChain.doFilter(request,response);
            return;
        }
        //判断pc端登录状态，如果已经登录直接放行
        if (request.getSession().getAttribute("employee") != null){
            Long empId = (Long)request.getSession().getAttribute("employee");
            //将id插入到ThreadLocal中。通过线程的执行在后面进行公共字段的插入
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }
        //判断移动端登录状态，如果已经登录直接放行
        if (request.getSession().getAttribute("user") != null){
            Long userId = (Long)request.getSession().getAttribute("user");
            //将id插入到ThreadLocal中。通过线程的执行在后面进行公共字段的插入
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }

        //如果未登录则返回去登录页面
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    //匹配路径
    public boolean check(String[] urls, String requestURI){
        for (String url : urls){
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
